In a reflector antenna[?], the relative reduction in the effective aperture of the antenna caused by the masking effect of other antenna parts, such as a feed horn or a secondary reflector, which parts obstruct the radiation path.
... household in the village is $48,125, and the median income for a family is $49,375. Males have a median income of $41,719 versus $28,750 for females. The per capita income ...